IMG 301731
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I identified this device as Hering 's apparatus for color after-images. It is not.
I am quite sure it is Wundt’s Negtive Afterimage shown below.
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Fig. 199. Apparat zur Erzeugung complementer* j
farbiger Nachbilder.
Source: Wilhelm Wundt, Grundzuege der physiuologisehen Psychologie, 4th Ed, 1902,
Vol. 2, p. 204, Fig. 199 EB, Titchener shows the same instrument in a line drawing in
his A Textbook of Psychology. New York: Macmillan, 1910, p. 75. Fig. 6. The problem
is that there is no listing in Muensterberg’s article for Wundt’s negative afterimage
apparatus.